Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb1bbed9625a397…

MALICIOUS

PDF

84.3 KB Created: 2021-07-05 12:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6100ef78b047f5f2a9d34eccc668c3af SHA-1: a0d159780026e606e5a466ee4d26df496f79b40f SHA-256: 9cb1bbed9625a397c4e82919afec0dfa2b45732b4dfea12f214eccc0a8ad45cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The heuristics reveal it functions as a link farm, directing users to multiple PDF files hosted on compromised WordPress sites and disposable domains, likely to obscure the true malicious destination. The presence of a 'download button' lure further supports a malicious intent to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16b10a1569---27742084307.pdf In PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/53339627845.pdfIn PDF document text
    • https://ckd-otto.com/contents//files/55870755577.pdfIn PDF document text
    • https://led7.ru/file/46290958305.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/99830939843.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/zowupu.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/92004359448.pdfIn PDF document text
    • https://xistenze.com/files/files/39384791651.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/6dc867f7e6e2c4aa7207a4f6388d13f3/17022002443.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/nevefiwarezubopu.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ad42c63f2---kizoratosalijidos.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/pikozafezajukara.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/18182401761.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160827f1433ff2---gobijaxafuxapux.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2d1aaae88---jotib.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/ipkn27phuhu9uus2k653i7ge27/sotijexoganukipajepuf.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/d12e61b4e6763969c63893a56b9ceba0/pekilefefaboxezobak.pdfIn PDF document text
    • http://orsolyajuhasz.com/ckfinder/userfiles/files/42675576882.pdfIn PDF document text
    • http://coffee33.ru/archive/file/15464392214.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cc7080757---56580606000.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3145c3aed---39009633295.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/56440416861.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/2df7c5022c3b3f5eb5024504f4bbf5fe/vesakisobifexoxotigomoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=teatv+free+download+for+pcPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE0 17716 bytes
SHA-256: 1426190affbea9aa843855c8d07c44813501982a85229fa18cffd69e04f08da9
font_02_sfnt_off00012c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C29 10468 bytes
SHA-256: d949cb73d0a2ddfbe26e2a97443d5a2a52c17420790ab3b1cf3b1d82cfa61efa

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